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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8a9cd9f13bcba7d369e3803e2e094353d0d29286447cfd2595db050ae1de24' 
  AND token = '1RWBobgTCfBuUL9ilcVm5vhSj3mg8AAwNiU3kTnPX90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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