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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cabcb7a8dbd2f1a87f43bbe28439152a7c0f53c3f75c60f5c524876d86113e' 
  AND token = 'zoanlsgkXUF0HlYCjtcL5w3sjrkwAodrCXjZaITdvms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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