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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea66614d96cc6bd73cfaec8abb47e9357b7d6c9ee82de3120ef6f68755d2b43' 
  AND token = 'tetc86XJpbMxTJJpzVNFsThi9wdG7yac72syXRD3Wuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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