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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923a4e112e52939ff6b71fa321bb6e8c9e31f94072845243cba165e6c7395d39' 
  AND token = '0tpCOHc64HX7q5rRkfeLhcGcEVMVUEsCEvVkUQadRTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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