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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35164cbd933ab47fa075c722253a637c724e9c86b633ccb20b37bd270c16b81' 
  AND token = 'Ju4493tAtQr1tt7eov3OtqpmYKkjSM433ry69Tlhj80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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