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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4a868afb36c4378b3309658e41ff524ae466605ad8cf01217b829085b4d3e7' 
  AND token = '8nAPGAxt/vmKpcpQ5wDaeoi03C6fuTgqavSee3nRI18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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