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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168150b1c89383b047e9f51ba5fc3710c9f72088688549a3bd24b420c897b827' 
  AND token = 'uo2q6EzBp4qCqZ2AoKafg3WI1sxxtoGbVvBH4CUwc20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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