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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7174bc2141da2e2369be7b57f5b3f415c4d57596a8bee75fe71ce9063230b94' 
  AND token = '+tYDE738LxexXLNeZHoXkwh7OIeCURzt1AcvqguqWhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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