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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b92d033a189003c7763bd496fe0f7992ad023be84ced68c19446c09db8d2cfd' 
  AND token = 'NMPEYJtYPFd7ma5BAV2gEf+Lu9SlCulSjMa9w2WAEkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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