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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e184bb5039f246e9d79e8e937ba870eab3470cc4899114c61562a5c347ef37' 
  AND token = 'ci3oecYeD3L3BPhHmH1J33jtmRv08ZnAGwX661Id8Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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