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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbc6bbf99b55b176292c8ddc203001cc89800941ca7bca003f6020444d7eaf4' 
  AND token = 'W307n/RUnL4eojy4udYVzEC+KnkPhdthKa3UVQOPZl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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