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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ad3f582873432fe4bae7ab201e8239e9e3c9cd1d69f44ccc4360a4c217d6b0' 
  AND token = 'SIL3Stu9zoNJVMxQ2aoNWjUUbUNj3DU3aCeIaldLSvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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