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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97424ac06f1dc296290e2a0a2b50eff2eb5c2b672edc7a4e56f711f5821941f5' 
  AND token = 'sMiGrCCmRbOkCtAtdYJsTHbMHSZijBvUQBtdWxdk+XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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