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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1317c31b61474d5abfc41e77d3b6ab62107d6d5fcc7e9849619cfc5578a6094' 
  AND token = 'XXBWbyxz9xd1sJgmAPqdfv3n7VtAfFsgUJCnaMz39Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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