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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36fc073212ffe297bc5a5197ae26b8dc31271140ccea641c9dc6d3065e7bd1a' 
  AND token = 'cmf8iI3WE4ps4v3rack7aUCjD2hZB2j4HFQ3WiYO6PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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