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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f4d00681528df603f7b118758bd58e8677794bbb71872b77249764663c6851' 
  AND token = 'RUj6MdtaW1azOXpiJlzEEuuWUQJVQW36Wn7+ZB1qUWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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