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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c120b92079c2dddc28299db40cd16afe9fef6ed2e6f26c58b7a872f7110f6bca' 
  AND token = 'NixNzO/8SYxoHtYmLDLhpzbTBad4yprlp5FX5D6qv0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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