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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b1de61e4908b4f3f3fba725a4d793ab24be02a975211c0e88e932018b97cf9' 
  AND token = '1NB7sqMbvOvEg4vX2VLCXLsVzMLUXltagVeiJgqwQpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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