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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030d0739ebeba12d0b0cabee1b4e343111c35ce7d203868a4ee454c95d26a5d3' 
  AND token = 'h8ofc7C+nvEr2YViW8rS3drg2u1OV+jGdr7nzLHHMIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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