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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7849ad2cde25156e23670bfa262f4ab7f344e62b976ea6faf02ee4f91d15b83' 
  AND token = 'bBu28Opabv+xrTeErxagjdz9RpsQAOsv1NN0YRAE7zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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