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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00909144cb1fc4299371e48805816889d244885108ca9dedfa334704f3ca556f' 
  AND token = 'vho7hx2G+jvWYMWk0pQv0GF8pFtvABgxsqcQEGEyuGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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