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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bb0216c2ba0fa2eaad481f997dd98efd60597d879b0926806c734c9b918259' 
  AND token = '/+CYB/1/Hex2lm1m84wxf5XH0v5PvD+07LKtT6THyd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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