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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf17d4155e729fa7cbc46a649499995c6c9aee43733027080c088701446da35' 
  AND token = 'GNdF7fDVErpEyFTHQ13PGc2wXw6cFj8X3oQwJEK7WYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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