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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f66fc50893c8cf16be4741afffd1c9e38dd00ea5fe8427be61dca82b046a4b' 
  AND token = '+QOzXNvVd1/bO6gjaKf3ikpIgOON7H65fSVabPnBUuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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