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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c9a2cb1db9e97a6d8ef556d4615d9da5e45b463645938afd93260a19e0f92e' 
  AND token = 'Z2kf2BfPQxsMxId7wBlylaIYELUdM2IYpIlXCFju/eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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