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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba24569ed2bb5f2049d5eb774e50d4aaf6893aea7a56ce5134ac48f15a405fb' 
  AND token = 'l6YacgQH7uVJthoIrOr2vdOT5hnFHaXHFhZBULnYiOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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