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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77fcb577f81cfbdd4ada1a1512e80deb113ab8c9096c9a8100a450dfb3d56d4f' 
  AND token = '1VDpwPa47q35/Y75TH7W9KxXmoumlT99SpsphsTuX4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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