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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34c439108848aaf461316ca26379266ee52fb2c7dba10aa91f83a2f5121188b' 
  AND token = 'IfpB/lIxv7O8iK8+3Zf8hyE8Som1kIAKD5Bg4D2r5CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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