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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576995f91b586cca331bf4f66d57b379315be3390391b86a239a9ec9b0e28b40' 
  AND token = 'w3mj2IeeR1HLEQRm9ZGY7ACsMmoITCgJbmaaneXsRt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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