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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95242073e0f901f114870ee5a64fdf54ebae4b8512b7718359f69e8541dc5ae2' 
  AND token = '/s/8BzeHp2krYmuLesLfec2aev6bTNj3dBYKDtjj7K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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