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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65923fb0114bf7033a2b756c4248746c8dd155a8d2f9595f18a8de80a80d9f5a' 
  AND token = 'vHWdWn7YPauJE8FMiHb2uooib0tdQwM1p2CRSFJknVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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