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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4037a394f560dbda5e3ba07f29da160044e1083036e8b6b35c166fea0d1de8f6' 
  AND token = 'VL/+EHpOGGQsR++UMoXzIGVtpkSiB8HboDc6klQMImg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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