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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dee67ce551b0c03422de50f883a4aabdc04e4103b073e6e74c5f5929e6cc9d9' 
  AND token = 'j21VGoWwT+VTgN03Hsjyyejvf4i5i+bAz/luhNRh9ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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