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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515bf1283e02593cb9c99ccf5ee33c44a372fd9c1b3714289e4d1fb4c4f497a3' 
  AND token = 'xleovik+gxj5p8EIlzC8/+XkclhH1V8e4tTn9reErxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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