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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939a2bbec6fd34a86540bd912b9ce04f915e0064342df9e68c880ba416bf056e' 
  AND token = 'rHqRNvtjV8QS7W65c+NArPwEiiOMTWT2lsM8ujF+2tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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