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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88feb937597cedd396d700d438d973b1d610fde940a4d9f0513365f3f602da18' 
  AND token = 'btle6uTMn7dF1qe1Nc/GJnLLXLTHYTWn0r7ya2K3zyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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