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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf21bc10220db77f0d4179436923d9b7298508cc210c6a6f876c7490c409f89' 
  AND token = 'sY164OfQwY9MAfYf+F8XI6j8ZMVFQQpjc4vPfeZ+B2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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