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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb11bd9c5aa748a95b48bebe807f8577a9d13cc48b0a25dd7e9b83f5adea9cb5' 
  AND token = 'alafQmGMzo42l7h0GpP8LE5YsvsuZXe8ubRWsvM9/LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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