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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec47f1ab819bdc7b216c95712891a05b28c417a6db5e3ade62d4ffa2f3e9948f' 
  AND token = 'tiexfGsYNV6QMRehss6UHyABnwbSiSkUGua38ydmuio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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