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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b03ce4ba94d43b56b171cf259e79d6c36db7e71239754465ce2df18925da88e' 
  AND token = 'E29XyjE7RRKctPjNDOuNyXqGSf31BZ4Pr2qf0xl4Tss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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