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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc16fc801720b17e8730b60a00d1e54bac4a7f04836f90f26834c72337f20bc3' 
  AND token = 'dE+x/+BfVliMpdWJMTOERT8pY2XABXtFwC5jTRl87C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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