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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace5d665605005b385723478e1793f61307500ca1762e7133872b80176a80b75' 
  AND token = 'hQ1djJgryEu6yf2GaDvJZNwe+rFYaKuPM1PVDq35BlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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