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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f93cbee2004c8d77011a29060648757f820b422bc453b0be959e4a808b1c55' 
  AND token = 'GymMFCF12MrxgVLGc6032du3JQPOXrkwFGec5LbHTCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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