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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f1efb45615026691266c4d0a1396392731a76d1fbc24f2181248b176e5dda6' 
  AND token = 'Ja3LlPc8d3vCutLmyNbFcySZLF4D0ASXIo14fRiDeac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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