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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af4f9f924d9eeed026e15ed8804966dadaaa065e65b5edefb5c5c8315a7db9d' 
  AND token = '0/C6nYRTVbpmEcotpGEk37GyhbwmsVo+B8RgCgsJ/D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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