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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625d8de1c081d1c26df74fcb0fc1e60994b48cacdd702754d7ad00b892a98633' 
  AND token = '3aBe2XqJg6/3fwcwpSqC0j9GrARWP+K7fmkAA1K+rBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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