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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eae082e9cf52cc7c99fae0c4ea8c1353bb10a00035d792038655ba2e69ff139' 
  AND token = 'VStzPKUXqAY38lzBNn6O7tehpWF7ZUTD0pzWz5ysZiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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