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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39da6ec496ec86a11d9664e3573c324ebc292ac7ee1d25d6aa107164f11ac1da' 
  AND token = 'VcBl2dLPZXevIvtZkP8NPvJksofc6s0d+F1Nao2Cvf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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