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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3779cb42098026100353945f31ea659e30da15e0680a0caf020456f02a66814' 
  AND token = 'qYGGq2pNisriwxy5ZQQV+XnszQi7J1L1rSNuKBN+ekk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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