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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a964d5a96871b1bd7507fcded3fec66efffa7c1313dad48ce9f53592285835ba' 
  AND token = 'fFT3NvQAYI5Y08fewN717qntw/KMAe7HGX8UiA2tOaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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