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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d000063aa0076b7599fd233a0cdb594de2e05cc303dbe83e61d3395dc9610ff' 
  AND token = 'EDcGhdxDa6Mnmt524hF58XPCnQleXs5TRdoW2WjWp+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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