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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda42a88a29dd0a08cbea43b3b5b753675ee4227a5ae8abebe8b4250136cc568' 
  AND token = 'Q91MyoYz027m04aTEW7edKvmrR8sa4cHXUp53J3SkOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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