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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0706653c475d02ab2256ad404375f62ca044cc6b84688cf05caab1b4d14c25b' 
  AND token = 'Q/X6eu+e7Hr3P/SthnHf9JOLc2PXIfa0CFRcUBLRALQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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