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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a18a5292dd87665fd33534f130f1e6a24dbc32fd792ba4522618e205c9190a' 
  AND token = '8eeNFFxH5ZiJfEn10QkBbXG7tnlSwUXTkuQgee7rl5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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