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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da56180ac9f78cb3fbb3116a4404b72fdec401bdb7cd366de5a83e44499b6ddb' 
  AND token = 'DEW1A47UpW0vsUDVX0CWD3dozUkmND7GzQ53/qu8uR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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