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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dfbb40cd2e555bc2a471e3c73f6863467f93bd06c1df598e6074e3a11d9786' 
  AND token = 'N+G/HhW1qsvxooc72N9JWDQGgdS0d4NQn/gq4ocvbio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}