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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefce71167d1bef596f9b754a3c020734bfc7b2a8761cbee87fd3bdb9e1e50fb' 
  AND token = 'bWq7pr0XGnbdqbT0BnJqVkX3y3t8TZUBww04W4hNgvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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