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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cb9eab12f950e3faf634d16518eb1e2e6d1441a9ba3c01c8875d53d95fae1e' 
  AND token = 'nDnT3LfWqJUm28CoNA7BW4RLwZB882eQ5D/NO15o08U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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