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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea6602c06e5971d24c8aec6f315f20abda577a63c9f05bf98f45fcb931f2bdb' 
  AND token = 'baUt/Hk5Cjhgsg0g4rMnul14OhZWp7UmMpq7a/vqSUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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