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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a546588486ba5021a0fc1602d8d39b0f3711646ce336c2e41254dd8cc895dc3f' 
  AND token = '0bt5IutcJyEZ20MLWwbNsx7Yz7nTQBvPCig8aMZTavI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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