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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131620d991d56abf752c637e4ff75364e6991b563c078d284eed053fa8a089af' 
  AND token = 'fD3s0n0uRFI3aq6+mkaaI8paSFgxX4h96IQoxu9/s9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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