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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170ca38ff30b2313c5f998d766d0dc3c2ca5b8e54ea0e8a87b19f3a7bc17eaf8' 
  AND token = 'p/l+IT61UXpOgW1tApa8faN3szZToSanL3ScE6hvTO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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